для оформления кода, второе:
[SRC java]
public class ConnectorBD {
    Connection con;
  public close(){
     if(con!=null){
      con.close();     
      }
  }
public Connection getConnection(){
 try{
Class.forName("org.gjt.mm.mysql.Driver");
con = DriverManager.getConnection(url,"root","");
   if(con==null){
     JOptionPane.showMessageDialog(null, "Не Не удалось получить соединение с сервером", "Внимание", JOptionPane.INFORMATION_MESSAGE);
     return null;
     }
     }catch(SQLException e){
       e.toString();
     }
   catch(ClassNotFoundException e){
     e.toString();
   }
 return con;
 }
}

   public   class  BuildQuery(){
        ConnectorBD db= new  ConnectorBD();
        Vector vec= new  Vector(); 
        ResultSet rs;
        PreparedStatement prst'   
 public  Vector runQuery(String sql){
    try {   
    prst = bd.getConnection().prepareStatement(sql);
       rs=prst.executeQuery();
 while (rs.next()) {
  vec.add(rs.getString( 2 ));
     }
     rs.close();
     prst.close();
     bd.close();
         return   vec;  
}
} catch (Exception g){
   .......
   return   null ;
  }
}

   public   class  ZZZ{
     Vector result= new  Vector();
     String q="select * from user";
     BuildQuery startQuery= new  BuildQuery();
      result= startQuery(q);
        if (result!= null ){
                  for ( int  i= 0 ;i<result.size();i++){
          System.out.println("RESULT="+result.elementAt(i));
               }
       }
   }